CN215221747U - Flexible direct current offshore converter station - Google Patents

Abstract

The utility model provides a flexible direct current offshore convertor station, the whole convertor station is divided into an upper layer and a lower layer, and the upper layer is sequentially and adjacently provided with a radiator, a convertor transformer chamber, a switch field, a neutral line valve hall and a neutral line direct current field according to the same direction; the lower layer is provided with a polar line valve hall and a polar line direct current field respectively corresponding to the positions of the neutral line valve hall and the neutral line direct current field, the position corresponding to the converter transformer chamber is divided into two layers of alternating current fields and cable layers which are arranged up and down, and the position corresponding to the switch field is arranged into a first auxiliary production area; each floor space is symmetrically arranged through a middle corridor so that the converter stations form a true bipolar four-valve hall four-direct-current field pattern. The utility model discloses overall structure is compact, the marine converter station of flexible direct current who compares same capacity has less size and volume to can effectively save the investment and the maintenance cost of marine booster station in the deep and far sea wind electric field of tradition, reduce the construction cost in deep and far sea wind electric field.

Description

Flexible direct current offshore converter station

Technical Field

The utility model relates to a technical field of marine wind power and flexible direct current transmission.

Background

In recent years, global offshore wind power development shows a far-sea development trend, compared with offshore near-distance offshore wind power, deep and far-sea wind power with the offshore distance of more than 100km and the water depth of more than 50m has higher wind speed, has less limitation on environmental noise, magnetic waves and landscape influence, and has huge wind energy resources and wide sea area resources, so the deep and far-sea wind power becomes an important direction for future offshore wind power development.

At present, the grid-connected mode of wind power transmission at deep sea is mainly divided into two main types of high-voltage alternating current transmission and high-voltage direct current transmission, wherein the high-voltage direct current transmission adopts a flexible direct current mode. For a long-distance deep offshore wind power project, the high-voltage alternating-current power transmission has too many limiting factors due to the consideration of the reactive compensation problem of the line. The remote high-voltage flexible direct-current transmission adopting true double wiring has the advantages of controllable offshore wind power flow and voltage, large transmission capacity, capability of providing reactive support for the system, easiness in forming a multi-terminal direct-current system and the like in the process of sending out the far-sea wind power. Therefore, the true double-wiring long-distance high-voltage flexible direct-current transmission is the main direction for carrying out the ultra-long-distance offshore wind power construction in the future.

High-voltage flexible direct-current transmission is a new generation of direct-current transmission technology formed by a voltage source converter formed on the basis of fully-controlled power electronic devices. The high-voltage flexible direct-current transmission system can independently change the phase and amplitude of the output voltage of the high-voltage flexible direct-current transmission system, so that the active power and the reactive power output by the high-voltage flexible direct-current transmission system can be conveniently and quickly adjusted. The method has stronger technical advantages in the aspects of improving the stability of the power system, increasing the dynamic reactive power reserve of the system, improving the quality of electric energy, solving the influence of nonlinear load and impact load on the system, ensuring the power supply of sensitive equipment and the like, and is particularly suitable for the aspects of renewable energy grid connection, distributed power generation grid connection, island power supply, large-scale urban power grid power supply and the like.

The high-voltage flexible direct-current convertor station with a true bipolar structure consists of an alternating-current field, a convertor transformer, a switching field, a connecting area, a valve hall, a direct-current field and other areas. Wherein the coupling zone is a region in the flexible dc converter station that couples the ac field distribution device and the valve hall. The valve hall is a place for discharging the replacement flow valve in the flexible direct current converter station and is a core area in the flexible direct current converter station. The converter valve of the flexible direct current converter station is divided into two converter valve groups of a positive pole and a negative pole, each converter valve group comprises three bridge arms of an A phase, a B phase and a C phase, and a converter valve tower generally adopts a supporting structure and can also adopt a suspension type structure. A power distribution device is a generic term for an electrical device capable of controlling, receiving, and distributing electric energy, and is functionally complete, including electrical equipment having various functions, such as a bus bar, a circuit breaker, a disconnecting switch, a reactor, a lightning arrester, a transformer, a cable, and a measuring instrument, and the like.

In the flexible engineering of directly sending out of open sea wind-powered electricity generation of tradition, mainly adopt monopole symmetry wiring, compare, true bipolar wiring mode has the operation mode diversified, and system reliability is high, advantages such as transport capacity is big. At present, no flexible direct current offshore converter station with true bipolar connection exists.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the shortcoming that exists among the prior art, provide a compact structure, cost are with low costs and can realize the marine converter station of real bipolar flexible direct current that the long-range marine wind power of large capacity sent out.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

a flexible direct current offshore converter station is divided into an upper layer and a lower layer, wherein the upper layer is sequentially and adjacently provided with a radiator, a converter transformer chamber, a switch field, a neutral valve hall and a neutral direct current field in the same direction; the lower layer is provided with a polar line valve hall and a polar line direct current field respectively corresponding to the positions of the neutral line valve hall and the neutral line direct current field, the position corresponding to the converter transformer chamber is divided into two layers of alternating current fields and cable layers which are arranged up and down, and the position corresponding to the switch field is arranged as a first auxiliary production area; each floor space is symmetrically arranged through the middle corridor so that the converter station forms a true bipolar four-valve hall four-direct-current field pattern.

Furthermore, the neutral line valve hall is divided into an independent polar I neutral line converter valve hall and a polar II neutral line converter valve hall through a two-layer corridor; the polar line valve hall is divided into an independent polar I polar line converter valve hall and a polar II polar line converter valve hall through a layer of corridor; the polar I polar line converter valve hall is arranged below the polar I neutral line converter valve hall in a facing manner, and the polar II polar line converter valve hall is arranged below the polar II neutral line converter valve hall in a facing manner.

Furthermore, a converter valve tower and a bridge arm are arranged in each valve hall; the converter valve towers are arranged according to the phase sequence of ABC or CBA.

Further, the neutral line direct current field is divided into an independent neutral line direct current field I and an independent neutral line direct current field II through a second-layer corridor; the polar line direct current field is divided into an independent polar I polar line direct current field and a polar II polar line direct current field through a layer of corridor; the polar I polar line direct current field is arranged below the polar I neutral line direct current field in a facing manner, and the polar II polar line direct current field is arranged below the polar II neutral line direct current field in a facing manner.

Furthermore, a neutral line direct current field of the pole I is close to a neutral line converter valve hall of the pole I; and the pole II neutral line direct current field is close to the pole II neutral line converter valve hall.

Further, the first sub-production zone is divided into a plurality of layers and each layer is provided with a plurality of compartments.

Further, the first sub-production zone occupies the remaining space between the polar line valve hall and the cable layer and the ac field.

Furthermore, a second auxiliary production area is arranged above the neutral line direct current field, and the sum of the heights of the second auxiliary production area and the neutral line direct current field is the same as the height of the neutral line valve hall.

Furthermore, the converter station is also provided with a cable shaft penetrating through the neutral line direct current field and the polar line direct current field; the cable shafts are positioned at two sides of the tail end of the corridor and used for leading out the direct current submarine cables.

Further, the ac field includes a high voltage gas insulated metal enclosed switchgear (GIS); the converter transformer chamber comprises a converter transformer and a power distribution device thereof; the switch yard comprises power distribution devices such as an isolating switch, a grounding switch, a lightning arrester, a current measuring device, a voltage measuring device and the like; the neutral line valve hall and the polar line valve hall comprise converter valves and power distribution devices thereof; the neutral line direct current field and the polar line valve hall comprise bridge arm reactors and direct current distribution devices.

The offshore converter station platform of the technical scheme can not only give full play to the advantage of high-capacity output of the true bipolar wiring flexible direct current, but also has compact integral structure and smaller size and volume compared with a flexible direct current offshore converter station with the same capacity, thereby effectively saving the investment and maintenance cost of an offshore booster station in the traditional deep and far sea wind farm and reducing the construction cost of the deep and far sea wind farm. In addition, each internal space of the technical scheme is reasonably arranged, the region is clearly set, rooms such as an alternating current field, a converter transformer room, a switch yard, a valve hall and a direct current field are compactly arranged, auxiliary production areas are reasonably and intensively arranged, a main cable channel in the converter station is concise and smooth, and equipment in the station is convenient to install, operate and maintain.

Drawings

Fig. 1 is a longitudinal sectional view of the present invention.

Fig. 2 is a sectional view taken along line a-a of fig. 1 according to the present invention.

Fig. 3 is a sectional view of the present invention taken along line B-B of fig. 1.

Fig. 4 is a cross-sectional view of fig. 1 taken along line C-C.

Fig. 5 is a cross-sectional view taken along line D-D of fig. 1 according to the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Reference is made to figure 1. The converter station of the embodiment is mainly divided into an upper layer and a lower layer, wherein the upper layer is sequentially and adjacently provided with a radiator 1200, a converter transformer room 200, a switch field 300, a neutral valve hall 600 and a neutral direct current field 900 according to the same direction; the lower layer is provided with a polar line valve hall 700 and a polar line direct current field 1000 respectively corresponding to the positions of the neutral line valve hall 600 and the neutral line direct current field 800, the position corresponding to the converter transformer room 200 is divided into two layers, an alternating current field 100 and a cable layer 400 are respectively arranged on the upper layer and the lower layer, the position corresponding to the switch yard 300 is arranged as a first auxiliary production area 500, and the first auxiliary production area 500 occupies the residual space between the polar line valve hall 700 and the cable layer 400 as well as between the polar line valve hall 700 and the alternating current field 100. The first sub-production zone 500 is likewise divided into upper and lower levels, with each level being provided with a plurality of compartments. A second sub-production area 800 is also provided above the neutral dc field 900, and the sum of the heights of the second sub-production area 800 and the neutral dc field 900 is the same as the height of the neutral valve hall 600. Therefore, according to the division of the functional areas, each layer is divided into an upper layer and a lower layer at the required position, and therefore the whole converter station is actually arranged in a single-platform four-layer mode. And the middle part of each layer of space is also provided with a corridor, and all functional areas and rooms are symmetrically distributed on two sides of the corridor, so that the converter station forms a four-direct-current field pattern of a true bipolar four-valve hall.

Specifically, the four-valve hall four-direct-current field pattern is embodied as follows: the neutral valve hall 600 is divided into an independent polar I neutral valve hall 610 and a polar II neutral valve hall 620 through the corridor on the floor where the neutral valve hall is located; the polar line valve hall 700 is divided into an independent polar I polar line valve hall 710 and a polar II polar line valve hall 720 through a corridor of the floor where the polar line valve hall is located; the pole i pole line converter valve hall 710 is arranged just below the pole i neutral line converter valve hall 610, and the pole ii pole line converter valve hall 720 is arranged just below the pole ii neutral line converter valve hall 620. Similarly, the neutral dc field 900 is divided into independent i-neutral dc fields 910 and ii-neutral dc fields 920 by the level corridor; the polar line direct current field 1000 is divided into an independent polar I polar line direct current field 1010 and a polar II polar line direct current field 1020 through a corridor where the polar line direct current field is located; the polar I polar line DC field 1010 is arranged below the polar I neutral line DC field 910 in a facing manner, and the polar II polar line DC field 1020 is arranged below the polar II neutral line DC field 920 in a facing manner. The polar i neutral dc field 910 is immediately adjacent to the polar i neutral converter valve hall 610; the pole ii neutral dc field 920 is immediately adjacent to the pole ii neutral converter valve hall 620.

In particular, the converter station is also provided with a cable shaft 1100 passing through the neutral line dc field 900 and the polar line dc field 1000; the cable shaft 1100 is located at both sides of the end of the corridor for direct current submarine cable outgoing.

Reference is made to fig. 2 and 3. The heights of the polar I polar line converter valve hall 710, the polar II polar line converter valve hall 720, the polar I polar line direct current field 1010 and the polar II polar line direct current field 1020 which are divided through the corridor occupy the lower layer height of the whole converter station, wherein the lengths of the polar I polar line converter valve hall 710 and the polar II polar line converter valve hall 720 are smaller than and approximate to half of the length of the flexible direct current offshore converter station. The lengths of the polar I polar line direct current field 1010 and the polar II polar line direct current field 1020 are less than one third of the length of the flexible direct current offshore converter station. A pole I converter valve and a power distribution device thereof are arranged in the pole I pole converter valve hall 710, a pole II converter valve and a power distribution device thereof are arranged in the pole II pole converter valve hall 720, and a pole I bridge arm reactor and a direct current power distribution device thereof, a pole II bridge arm reactor and a direct current power distribution device thereof are correspondingly arranged in the pole I pole direct current field 1010 and the pole II pole direct current field 1020 respectively. The first auxiliary production area 500 is close to one side of the polar valve hall, the height of the upper layer of the first auxiliary production area corresponds to the height of the adjacent alternating current field 100, and secondary control equipment, protection equipment (such as a valve cooling chamber, a seawater pump room, fire protection and the like), a communication screen cabinet, a storage battery and the like are mainly arranged; the height of the lower layer corresponds to the height of the adjacent cable layer 400, and an auxiliary transformer is mainly arranged. Due to the difference in the space requirements of the ac field 100 and the cable layer 400, the length of the ac field 100 in this embodiment is greater than one ninth of the total length of the converter station, and the length of the upper layer of the first sub-production area 500 is slightly smaller than the length of the lower layer. The cable layer 400 is mainly used for routing an ac cable. Through the arrangement of the cable shaft 1100 and the cable layer 400, the direct current cables and the alternating current cables are reasonably arranged, and the problems of safety and reduction of space utilization rate caused by line interference are avoided. The ac field 100 is provided with a high voltage gas insulated metal enclosed switchgear (GIS) and a connection transformer, and the ac field 100 is electrically connected to the converter transformer chamber 200 directly above the ac field through a GIL pipe.

Reference is made to fig. 4 and 5. The heights of the polar i neutral line converter valve hall 610 and the polar ii neutral line converter valve hall 620 divided by the corridor occupy the upper level of the whole converter station, the heights of the polar i neutral line direct current field 910 and the polar ii neutral line direct current field 920 occupy three quarters of the upper level of the whole converter station, and the second sub-production area 800 located above the polar i neutral line direct current field 910 and the polar ii neutral line direct current field 920 occupies one quarter of the upper level. The neutral valve hall 600 is aligned in length with the underlying poled line valve hall 700 and the neutral dc field 900 is aligned in length with the underlying poled dc field 1000. The polar I neutral line converter valve hall 610 is internally provided with a polar I neutral line converter valve and a power distribution device thereof, and the polar II neutral line converter valve hall 620 is internally provided with a polar II neutral line converter valve and a power distribution device thereof. A pole I neutral line bridge arm reactor and a direct current distribution device thereof, and a pole II neutral line bridge arm reactor and a direct current distribution device thereof are respectively and correspondingly arranged in a pole I neutral line direct current field 910 and a pole II neutral line direct current field 920. The second auxiliary production area 800 may be disposed with a fresh air room, a refrigeration room, a spare part room, etc. as an auxiliary room.

The height of the switchyard 300 next to the neutral valve hall 600 also occupies the upper level of the converter station and is about a quarter of the length of the converter station. Inside the switch yard 300, there are power distribution devices such as isolating switch, grounding switch, lightning arrester, current measuring device and voltage measuring device, which are connected to the neutral line valve hall 600 and the polar line valve hall 700 through flexible wires and wall conduits.

The height of the converter transformer room 200 next to the switch yard 300 also occupies the upper level of the converter station, and the converter transformer and the power distribution device thereof are arranged inside the converter transformer room, and the length of the converter transformer room is the same as that of the alternating current field 100 right below the converter transformer room. The radiator 1200 is arranged on the outer side of the converter transformer chamber 200 to guarantee heat dissipation of the converter transformer, and the height of the radiator is lower than the height of the upper layer of the converter station. The converter transformer is electrically connected with the switch yard 300 through a wall bushing.

Specifically, in the present embodiment, each valve hall (i.e., pole i neutral line converter valve hall 610, pole ii neutral line converter valve hall 620, pole i pole line converter valve hall 710, and pole ii pole line converter valve hall 720) is provided with three arms of a six-valve tower, and the converter valve towers in each valve hall are arranged in the phase sequence of "ABC" or "CBA". Bridge arm reactors of each direct current field (namely a polar I neutral line direct current field 910, a polar II neutral line direct current field 920, a polar I polar line direct current field 1010 and a polar II polar line direct current field 1020) are arranged in a straight line.

The flexible direct current converter station of the embodiment effectively reduces the construction cost of the deep and distant sea wind power plant through intensive arrangement, the comprehensive benefits remarkably save the construction cost of the deep and distant sea wind power plant, meanwhile, the reliability of the system is improved, high-power wind power can be transmitted, and the comprehensive benefits are remarkable by adopting a true bipolar wiring mode.

It should be noted that the above describes exemplifying embodiments of the invention. However, it should be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, which are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the scope of the present invention, and the changes and modifications are intended to fall within the scope of the present invention as claimed.

Claims (10)

1. A flexible direct current offshore converter station is characterized in that the whole converter station is divided into an upper layer and a lower layer, wherein the upper layer is sequentially and closely provided with a radiator, a converter transformer chamber, a switch field, a neutral line valve hall and a neutral line direct current field in the same direction; the lower layer is provided with a polar line valve hall and a polar line direct current field respectively corresponding to the positions of the neutral line valve hall and the neutral line direct current field, the position corresponding to the converter transformer chamber is divided into two layers of alternating current fields and cable layers which are arranged up and down, and the position corresponding to the switch field is arranged into a first auxiliary production area; each floor space is symmetrically arranged through a middle corridor so that the converter stations form a true bipolar four-valve hall four-direct-current field pattern.

2. A flexible dc offshore converter station according to claim 1, characterized in that said neutral valve hall is divided by a two-level corridor into separate polari and polarii neutral valve halls; the polar line valve hall is divided into an independent polar I polar line valve hall and an independent polar II polar line valve hall through a layer of corridor; the polar I polar line converter valve hall is arranged below the polar I neutral line converter valve hall in a facing manner, and the polar II polar line converter valve hall is arranged below the polar II neutral line converter valve hall in a facing manner.

3. The flexible direct current offshore converter station according to claim 2, wherein a converter valve tower and a bridge arm are arranged in each valve hall; the converter valve towers are arranged according to the phase sequence of ABC or CBA.

4. A flexible dc offshore converter station according to claim 2, characterized in that said neutral dc field is divided into separate neutral dc field of pole i and neutral dc field of pole ii by two levels of corridors; the polar line direct current field is divided into an independent polar I polar line direct current field and a polar II polar line direct current field through a layer of corridor; the polar I polar line direct current field is arranged below the polar I neutral line direct current field in a facing manner, and the polar II polar line direct current field is arranged below the polar II neutral line direct current field in a facing manner.

5. A flexible DC offshore converter station according to claim 4, characterized in that said POL I neutral DC field is immediately adjacent to said POL I neutral converter valve hall; and the polar II neutral line direct current field is close to the polar II neutral line converter valve hall.

6. A flexible dc offshore converter station according to claim 1, characterized in that said first sub-production zone is divided into a plurality of levels and each level is provided with a plurality of compartments.

7. A flexible DC offshore converter station according to claim 1 or 6, characterized in that said first sub-production zone occupies the remaining space between said polar line valve hall and said cable layer and said AC field.

8. A flexible dc offshore converter station according to claim 1, characterized in that a second auxiliary production zone is provided above said neutral dc field, the sum of the heights of said second auxiliary production zone and said neutral dc field being the same as the height of said neutral valve hall.

9. A flexible dc offshore converter station according to claim 1, characterized in that said station is further provided with a cable shaft passing through said neutral dc field and said polar dc field; the cable shaft is located at two sides of the tail end of the corridor and used for leading out the direct current submarine cable.

10. A flexible dc offshore converter station according to claim 1, characterized in that said ac field comprises a high voltage gas insulated metal enclosed switchgear (GIS); the converter transformer chamber comprises a converter transformer and a power distribution device thereof; the switch yard comprises power distribution devices such as an isolating switch, a grounding switch, a lightning arrester, a current measuring device and a voltage measuring device; the neutral line valve hall and the polar line valve hall comprise converter valves and power distribution devices thereof; the neutral line direct current field and the polar line valve hall comprise bridge arm reactors and direct current distribution devices.

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